ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Agate geode. Macrophotograph of the interior of a geode containing agate. A geode is a hollow ball of rock with crystals (usually quartz) growing from its inner wall. Agate is a type of quartz. Geodes are often cut and used as ornaments. Magnification: x1.5 at 4x5 inch size.
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